(57) A flame hole unit structure of a combustion apparatus provided with a plurality of
flame holes for forming a flame comprises: a lean flame hole unit including, as a
flame hole for jetting lean gas, at least one lean flame hole extending along the
longitudinal direction which is a direction perpendicular to the jetting direction
of the lean gas; and a rich flame hole unit including, as a flame hole for jetting
rich gas, a pair of rich flame hole provided an both sides of the lean flame hole
unit with respect to a width direction which is a direction perpendicular to the jetting
direction and the longitudinal direction and extending along a direction parallel
to the longitudinal direction. When a region, which is defined at the top end of the
rich flame hole by means of first and second lines that are arbitrary imaginary lines
across the rich flame hole, and by means of a pair of rich flame hole walls spaced
apart along the width direction and forming a part of the rich flame hole between
the first and second lines, is referred to as a reference region, then the rich flame
hole includes a region which is designed such that, at the time of generating the
flame by the rich gas, between arbitrary reference regions of the same size, the sum
of the amounts of heat transferred to the pair of rich flame hole walls forming each
reference region is substantially the same.
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